Reporting Spam: Is It Ethical

Interesting thread at SEW Forums named Ethics on Spam Reporting. This thread is interesting because it talks about ethics from the other side of the coin. Most of the time, threads discussing ethics are on the topic of using "black-hat seo" techniques. But what if you find a site that is using these black hat techniques, is it ethical to report them to the search engines?

Just a different twist to the classical debate between black hats and white hats. Make sure to check out the thread at Search Engine Watch Forums.